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Python:
A dynamic language emphasizing readability.
Node.js:
Evented I/O for V8 JavaScript.
C:
Low-level and cross-platform imperative language.
Java:
A concurrent, class-based, statically typed object-oriented language.
C++:
A general purpose system programming language.
Ruby:
A natural dynamic object-oriented language.
HTML, CSS, JS:
The languages that make up the web.
Scheme:
An elegant dynamic dialect of Lisp.
Go:
Statically typed yet expressive language with a focus on concurrency.
Rust:
A fast and safe systems programming language.
Practical
Clojure:
A modern JVM-based Lisp dialect with a focus on immutability
Haskell:
An advanced, purely functional programming language
Kotlin:
Statically typed programming language interoperable with Java and Android
Scheme:
An elegant dynamic dialect of Lisp.
Lua:
A lightweight multi-paradigm scripting language.
Ruby:
A natural dynamic object-oriented language.
Python:
A dynamic language emphasizing readability.
Node.js:
Evented I/O for V8 JavaScript.
Deno (beta):
A secure runtime for JavaScript and TypeScript
Go:
Statically typed yet expressive language with a focus on concurrency.
C++:
A general purpose system programming language.
C:
Low-level and cross-platform imperative language.
C#:
A Microsoft .NET programming language.
F#:
A Microsoft .NET functional programming language.
Rust:
A fast and safe systems programming language.
Swift:
A modern general-purpose programming language from Apple.
Python (with Turtle):
A simple version of Python that supports Turtle.
R:
A programming language and environment for statistical computing and graphics
Bash:
The classic Unix shell
Crystal:
Fast as C, slick as Ruby
Julia:
A language for high-performance numerical analysis and computational science.
Elixir:
A functional, concurrent, general-purpose programming language that runs on the Erlang VM
Nim:
An imperative, multi-paradigm, compiled programming language
Dart:
A general-purpose programming language used to build web, server, desktop, and mobile applications.
Reason Node.js:
Reason compiling to Node.js (via BuckleScript)
Tcl:
A high-level language designed with the goal of being very simple but powerful
Erlang:
A general-purpose, concurrent, functional programming language
TypeScript:
A typed superset of JavaScript.
Emacs Lisp (Elisp):
Scripting language for the extensible text editor.
SQLite:
Embedded SQL database engine.
Java:
A concurrent, class-based, statically typed object-oriented language.
PHP CLI:
A popular general-purpose scripting language.
Raku:
A highly capable, feature-rich programming language made for at least the next hundred years.
Scala (beta):
Scala combines object-oriented and functional programming in one concise, high-level language
Nix (beta):
A base repl for building anything you want in any language.
Web
CoffeeScript:
Unfancy JavaScript.
Roy:
Small functional language that compiles to JavaScript.
JavaScript:
The de facto language of the Web.
HTML, CSS, JS:
The languages that make up the web.
PHP Web Server:
A popular general-purpose scripting language.
Game Development
Pygame:
A cross-platform python graphics library
Love2D:
A free, open-source Lua framework for 2D games
Pyxel:
A retro game engine for Python
Classic
QBasic:
Structured programming for beginners.
Forth:
An interactive stack-oriented language.
APL:
An array-oriented language using funny characters.
Basic (beta):
A fun and simple programming language for beginners
Esoteric
LOLCODE:
The basic language of lolcats.
BrainF:
A pure Turing machine controller.
Emoticon:
Programming with an extra dose of smile.
Bloop:
Nothing but bounded loops.
Unlambda:
Functional purity given form.